//
//  UIButton+EnlargeTouchArea.m
//  SkyOne4iPhone
//
//  Created by Cheung on 15/12/8.
//  Copyright (c) 2015年 cqrd. All rights reserved.
//

#import "UIButton+EnlargeTouchArea.h"
#import <objc/runtime.h>
@implementation UIButton (EnlargeTouchArea)

static char topNameKey;
static char rightNameKey;
static char bottomNameKey;
static char leftNameKey;

- (void) setEnlargeEdgeWithTop:(CGFloat) top right:(CGFloat) right bottom:(CGFloat) bottom left:(CGFloat) left
{
    objc_setAssociatedObject(self, &topNameKey, [NSNumber numberWithFloat:top], OBJC_ASSOCIATION_COPY_NONATOMIC);
    objc_setAssociatedObject(self, &rightNameKey, [NSNumber numberWithFloat:right], OBJC_ASSOCIATION_COPY_NONATOMIC);
    objc_setAssociatedObject(self, &bottomNameKey, [NSNumber numberWithFloat:bottom], OBJC_ASSOCIATION_COPY_NONATOMIC);
    objc_setAssociatedObject(self, &leftNameKey, [NSNumber numberWithFloat:left], OBJC_ASSOCIATION_COPY_NONATOMIC);
    
}

- (CGRect) enlargedRect
{
    NSNumber* topEdge = objc_getAssociatedObject(self, &topNameKey);
    NSNumber* rightEdge = objc_getAssociatedObject(self, &rightNameKey);
    NSNumber* bottomEdge = objc_getAssociatedObject(self, &bottomNameKey);
    NSNumber* leftEdge = objc_getAssociatedObject(self, &leftNameKey);
    if (topEdge && rightEdge && bottomEdge && leftEdge)
    {
        return CGRectMake(self.bounds.origin.x - leftEdge.floatValue,
                          self.bounds.origin.y - topEdge.floatValue,
                          self.bounds.size.width + leftEdge.floatValue + rightEdge.floatValue,
                          self.bounds.size.height + topEdge.floatValue + bottomEdge.floatValue);
    } else {
        return self.bounds;
    }
}

- (UIView*) hitTest:(CGPoint) point withEvent:(UIEvent*) event
{
    CGRect rect = [self enlargedRect];
    if (CGRectEqualToRect(rect, self.bounds))
    {
        return [super hitTest:point withEvent:event];
    }
    return CGRectContainsPoint(rect, point) ? self : nil;
}



- (void)layoutButtonWithEdgeInsetsStyle:(MKButtonEdgeInsetsStyle)style
 imageTitleSpace:(CGFloat)space{
    // 1. 得到imageView和titleLabel的宽、高
    CGFloat imageWith = self.imageView.hj_width;
    CGFloat imageHeight = self.imageView.hj_height;
 
    CGFloat labelWidth = 0.0;
    CGFloat labelHeight = 0.0;
    if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {
        // 由于iOS8中titleLabel的size为0，用下面的这种设置
        labelWidth = self.titleLabel.intrinsicContentSize.width;
        labelHeight = self.titleLabel.intrinsicContentSize.height;
    } else {
        labelWidth = self.titleLabel.hj_width;
        labelHeight = self.titleLabel.hj_height;
    }
 
    // 2. 声明全局的imageEdgeInsets和labelEdgeInsets
    UIEdgeInsets imageEdgeInsets = UIEdgeInsetsZero;
    UIEdgeInsets labelEdgeInsets = UIEdgeInsetsZero;
 
    // 3. 根据style和space得到imageEdgeInsets和labelEdgeInsets的值
 switch (style) {
     case MKButtonEdgeInsetsStyleTop:
     {
         imageEdgeInsets = UIEdgeInsetsMake(-labelHeight-space/2.0, 0, 0, -labelWidth);
         labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith, -imageHeight-space/2.0, 0);
     }
         break;
     case MKButtonEdgeInsetsStyleLeft:
     {
         imageEdgeInsets = UIEdgeInsetsMake(0, -space/2.0, 0, space/2.0);
         labelEdgeInsets = UIEdgeInsetsMake(0, space/2.0, 0, -space/2.0);
     }
         break;
     case MKButtonEdgeInsetsStyleBottom:
     {
         imageEdgeInsets = UIEdgeInsetsMake(0, 0, -labelHeight-space/2.0, -labelWidth);
         labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0, -imageWith, 0, 0);
     }
         break;
     case MKButtonEdgeInsetsStyleRight:
     {
         imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+space/2.0, 0, -labelWidth-space/2.0);
         labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith-space/2.0, 0, imageWith+space/2.0);
     }
         break;
     default:
         break;
 }
 // 4. 赋值
 self.titleEdgeInsets = labelEdgeInsets;
 self.imageEdgeInsets = imageEdgeInsets;
 }


@end
